v1.4.0 Backend Module uses fluid instead of fusion

What's Changed

1. Feature: Adjust rendering of backend module from fluid to fusion by @mficzel in #61

Also limited extensibility was added with this pr:

Additionally Packages can now add additional fields to the forms of taxonomies and vocabularies. To do this
the following steps are required.

1. Extend the NodeTypes Sitegeist.Taxonomy:Taxonomy or Sitegeist.Taxonomy:Vocabulary in your package.
2. Add tha path to your additional Root.fusion to the Setting in path Sitegeist.Taxonomy.backendModule.additionalFusionIncludePathes.
3. In the fusion code define each field as prototype that accepts the props name plus taxon & defaultTaxon resp. vocabulary & defaultVocabulary.
4. Register addtional prototypesNames by adding them to the Settings Sitegeist.Taxonomy.backendModule.additionalVocabularyFieldPrototypes or Sitegeist.Taxonomy.backendModule.additionalTaxonomyFieldPrototypes

Full Changelog: v1.3.9...v1.4.0